I once did 223 miles in 10 days with a pack that started out at 40 pounds and ended at 18 pounds. I carried most of my food. Was I fastpacking? I don't really know.

Your gear depends on how fast/far you want to go and how many creature comforts you are willing to part with. It's a pretty personal decision.

I believe in paring weight down only to the point where it inhibits my efficiency. For instance, going too light with your sleep system may make you cold at night, lose sleep, and cost you some miles the next day. I'd rather carry an extra pound or so and sleep comfortably, waking up refreshed to tackle some big miles. I want to be light but I don't want to be miserable. Racing is a different story. If I'm not miserable when I'm racing, I'm not going fast enough!!!

Whatever you decide to take along, always leave a safety net.
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If you only travel on sunny days you will never reach your destination.*

* May not apply at certain latitudes in Canada and elsewhere.